The government tells us what medicines we may take and what recreational substances we may ingest, but when it comes to food, we decide what goes down our gullets. Gun-owning barbecuers coexist peacefully with Humane Society vegans. To paraphrase the old adage, your freedom ends where my stomach begins.

But not everyone is keen on emancipated eating. Public health puritans, appalled at the spread of excess weight, think the government should forcefully guide our dining choices. And when it comes to policy, they are getting a place at the table.

Last week, the San Francisco board of supervisors voted to hose the Happy Meal. No longer would McDonald's (or any other restaurant) be allowed to provide a free toy with a meal that exceeds specified amounts of fat, sugar, and calories. If the folks at the Golden Arches want to offer a Batman action figure, it will have to be flanked by fruits and vegetables.

San Francisco Supervisor Eric Mar said the Happy Meal ordinance addresses "a survival issue," and proclaimed, "We're part of a movement that is moving forward an agenda of food justice." Food justice?

Now, there are many places where the government ought to be: between a citizen and a mugger, between the polluter and the sky, between us all and al-Qaida. But the space between a diner's hand and a diner's mouth is not one of them.